Deductions & credits

I just wonder the IRS allow me to change the rental percentage of the parent and the sons because for the last 30 years the parents got 50% and the first son got 25% and second son got 25% on the rental property.

and now I want to change to the parents 25% and the first son take care of the property got 50% and the second son get 25%. and I know, Ican change on the turbotax but I don't know the IRS allow me to do that.

Thanks for your help.